A young woman's dedication to her country and family. Lan Yan Zhi, a Shanghai banker's daughter and student activist, receives a letter from the Japanese Army in 1937. Zhou Yu Hao, her Chinese Army crush, mistakes her for a spy. To establish her innocence, Yan Zhi infiltrates her closest friend Feng Man Na's home and helps Yu Hao search down "Mister Traitor." But what would Yan Zhi do when a family member is found?